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Commitments and Contingencies - Contingencies - Additional Information (Detail) € in Millions, $ in Millions, $ in Millions					1 Months Ended						6 Months Ended	12 Months Ended
	Oct. 21, 2019 USD ($) Number	Jun. 27, 2018 USD ($)	Aug. 21, 2017 USD ($)	Jul. 15, 2015 USD ($)	May 31, 2019 USD ($)	Jul. 31, 2015 USD ($)	Aug. 31, 2012 USD ($)	Dec. 31, 2010 USD ($)	Nov. 30, 2009 USD ($)	Aug. 31, 2008 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2014 CAD ($)	Jun. 30, 2020 EUR (€)	Mar. 31, 2020 CAD ($)	May 31, 2015 USD ($)	Jan. 31, 2009 USD ($)	Jul. 31, 2008 USD ($)	Feb. 28, 2005 USD ($)
Commitment And Contingencies [Line Items]
Damages assessment											$ 235.5
Sales														$ 94
Modafinil payment																	$ 1,200.0
Modafinil Euro sales | €															€ 46.5
Annual sales at the time of settlement																		$ 350.0
Annual sales of Effexor			$ 2,600.0
Annual sales of Lamictal																			$ 2,300.0	$ 950.0
Annual sales of Aggrenox				$ 1.1						$ 416.0
Annual sales of Actos							$ 2,800.0	$ 3,700.0
Annual sales of Acto plus							$ 430.0	$ 500.0
Annual sales of Namenda						$ 550.0			$ 1.1
Annual Sales Of Sensipar												$ 1,400.0
Modafinil payment remaining balance											19.0
Litigation settlement amount awarded cash amount	$ 20.0
Annual Sales Of Copaxone													$ 431.0
Opioid Litigation [Member]
Commitment And Contingencies [Line Items]
Litigation settlement amount	$ 25.0				$ 85.0
Litigation settlement amount awarded distribution period	3 years
Litigation settlement amount awarded number of installments | Number	4
Litigation settlement amount awarded cash amount distribution period	3 years
Nationwide Settlement [Member]
Commitment And Contingencies [Line Items]
Litigation settlement amount	$ 23,000.0
Litigation settlement amount awarded distribution period	10 years
Litigation settlement amount awarded cash amount	$ 250.0
Litigation settlement amount awarded cash amount distribution period	10 years
Eosinophilic Esophagitis [Member]
Commitment And Contingencies [Line Items]
Damage claimed											200.0
Eosinophilic Esophagitis [Member] | United States [Member]
Commitment And Contingencies [Line Items]
Damage claimed											150.0
Eosinophilic Esophagitis [Member] | Europe [Member]
Commitment And Contingencies [Line Items]
Damage claimed											50.0
AbbVie [Member]
Commitment And Contingencies [Line Items]
Legal fees											$ 448.0
Janssen and Millennium [Member]
Commitment And Contingencies [Line Items]
Maximum damages payable																$ 200
Litigation settlement awarded from other party		$ 5.0
AndroGel Rate at 1% [Member]
Commitment And Contingencies [Line Items]
Annual sales at the time of settlement																		$ 140.0

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